libc

constexpr auto spy::libc = libc_type{}

inlineconstexpr

LIBC version reporting value.

The spy::libc object can be compared to any other libc related value to verify if the code being compiled with a specific version of the libc.

Any libc related value can be checked for equality or ordering for a given version. The targeted version is then specified using a libc-dependent literal.

Additionally, any of the libc related value are convertible to bool. They evaluates to true if they matches the correct libc currently used.

Supported Value

Name	Vendor
spy::cloudabi_	CloudABI
spy::uc_	uClibc
spy::vms_	VMS
spy::zos_	zOS
spy::gnu_	GNU

Example

#include <spy/spy.hpp>
#include <iostream>
 
int main()
{
  // Comparisons
  if      constexpr( spy::libc == spy::gnu_ ) std::cout << "This code is compiled with the GNU libc.\n";
  else if constexpr( spy::libc == spy::zos_ ) std::cout << "This code is compiled with the zOS libc.\n";
  else if constexpr( spy::libc == spy::vms_ ) std::cout << "This code is compiled with the VMS libc.\n";
 
  // Direct test
  if      constexpr( spy::gnu_ ) std::cout << "This code is compiled with the GNU libc.\n";
  else if constexpr( spy::zos_ ) std::cout << "This code is compiled with the zOS libc.\n";
  else if constexpr( spy::vms_ ) std::cout << "This code is compiled with the VMS libc.\n";
}